Scans every compilation unit looking for private C++ class methods. Warns if there are ones that are not referenced (and the class seems to be fully defined, including all the methods and friends).

First download LLVM/Clang sources (version 3.2). Then

cd tools/clang/examples
mkdir dead-method
cd dead-method

and copy all the files here. After building the whole LLVM with Clang, issue inside the dead-method directory

make

You can find the plugin library in LLVM build directory (e.g. Debug+Asserts/lib/libDeadMethod.so).

Assume libDeadMethod.so could be found by ld (for example is in one of the directories in LD_LIBRARY_PATH). Then call

clang -Xclang -load -Xclang libDeadMethod.so -Xclang -add-plugin -Xclang dead-method a.cpp

will attempt to compile your code with dead-method plugin active.

• -Xclang means that the following argument should be passed to Clang frontend.
• to provide additional arguments to the plugin use -plugin-arg-dead-method (also preceded by -Xclang)
• if you want just check (no compilation) provide -fsyntax-only as well (without -Xclang)

The currently accepted arguments:

• include-template-methods - try to find unused private template methods also (many false-positives)
• ignore <file path> - do not warn about unused methods declared in <file path>; it must be the exact path as used by the compiler
• help - you will probably guess what it causes

I suggest you first run the compiler+plugin without ignore flag and later copy/paste the unwanted paths from warnings. Remember to provide -Xclang before every parameter that is to be passed to Clang and -plugin-arg-dead-method before every plugin argument. Example that would ignore header file /usr/include/bla.h

clang -Xclang -load -Xclang libDeadMethod.so -Xclang -add-plugin -Xclang dead-method -Xclang -plugin-arg-dead-method -Xclang ignore -Xclang -plugin-arg-dead-method -Xclang /usr/include/bla.h a.cpp

As you see it quickly becomes very long, so you'd better write a script that invokes the compiler.